resources: orgainize directory.

Should make it easier to ask just for images.

Change-Id: If821743dc924c4bfbc6b2b2d29b14affde7b3afd
Reviewed-on: https://skia-review.googlesource.com/82684
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
diff --git a/tests/SerialProcsTest.cpp b/tests/SerialProcsTest.cpp
index 6361309..d975abb 100644
--- a/tests/SerialProcsTest.cpp
+++ b/tests/SerialProcsTest.cpp
@@ -27,7 +27,7 @@
 };
 
 DEF_TEST(serial_procs_image, reporter) {
-    auto src_img = GetResourceAsImage("mandrill_128.png");
+    auto src_img = GetResourceAsImage("images/mandrill_128.png");
     const char magic_str[] = "magic signature";
 
     const SkSerialImageProc sprocs[] = {